package com.fr.chicken.util;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class IpUtil {
 public static String getIpAddr(HttpServletRequest request) {
             String ipAddress = null;
            try {
            ipAddress = request.getHeader("x-forwarded-for");
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
             ipAddress = request.getHeader("Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("WL-Proxy-Client-IP");
             }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
             ipAddress = request.getRemoteAddr();
             if (ipAddress.equals("127.0.0.1")) {
             // 根据网卡取本机配置的IP
             InetAddress inet = null;
            try {
             inet = InetAddress.getLocalHost();
            } catch (UnknownHostException e) {
             e.printStackTrace();
            }
             ipAddress = inet.getHostAddress();
             }
             }
             // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
            if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()
            // = 15
             if (ipAddress.indexOf(",") > 0) {
             ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
            }
            }
             } catch (Exception e) {
             ipAddress="";
            }
             return ipAddress;
             }
}
